Fire-Rated Door Sequencer Closer Unit

Dimensions: 15.5 cm L × 14.0 cm W × 2.0 cm D; material composition includes cold-rolled steel housing and UV-stabilised ABS plastic actuators. Provides deterministic, non-electronic coordination of dual fire doors to satisfy compartmentation requirements under Approved Document B (Fire Safety). Its ultra-slim 2.0 cm depth avoids interference with ceiling-mounted fire alarms or sprinkler heads — a frequent issue with bulkier coordinators in modern retrofits. Installation requires only four pre-drilled mounting points and alignment with standard door closer arm positions. Fully compatible with UK-specified intumescent seals and smoke control gaskets, maintaining full doorset performance when tested to BS 476-22 or EN 1634-1.